{{#packageName}}
    package {{packageName}};
{{/packageName}}

import org.apache.dubbo.common.stream.StreamObserver;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.PathResolver;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.ServerService;
import org.apache.dubbo.rpc.TriRpcStatus;
import org.apache.dubbo.rpc.model.MethodDescriptor;
import org.apache.dubbo.rpc.model.ServiceDescriptor;
import org.apache.dubbo.rpc.model.StubMethodDescriptor;
import org.apache.dubbo.rpc.model.StubServiceDescriptor;
import org.apache.dubbo.rpc.stub.BiStreamMethodHandler;
import org.apache.dubbo.rpc.stub.ServerStreamMethodHandler;
import org.apache.dubbo.rpc.stub.StubInvocationUtil;
import org.apache.dubbo.rpc.stub.StubInvoker;
import org.apache.dubbo.rpc.stub.StubMethodHandler;
import org.apache.dubbo.rpc.stub.StubSuppliers;
import org.apache.dubbo.rpc.stub.UnaryStubMethodHandler;

import com.google.protobuf.Message;

import java.util.HashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.concurrent.CompletableFuture;

public final class {{className}} {

    public static final String SERVICE_NAME = {{interfaceClassName}}.SERVICE_NAME;

    private static final StubServiceDescriptor serviceDescriptor = new StubServiceDescriptor(SERVICE_NAME,{{interfaceClassName}}.class);

    static {
        StubSuppliers.addSupplier(SERVICE_NAME, i -> newStub((Invoker<{{interfaceClassName}}>) i));
        StubSuppliers.addSupplier({{interfaceClassName}}.JAVA_SERVICE_NAME, i -> newStub((Invoker<{{interfaceClassName}}>) i));
        StubSuppliers.addDescriptor(SERVICE_NAME, serviceDescriptor);
        StubSuppliers.addDescriptor({{interfaceClassName}}.JAVA_SERVICE_NAME, serviceDescriptor);
    }

    public static {{interfaceClassName}} newStub(Invoker<{{interfaceClassName}}> invoker) {
        return new {{interfaceClassName}}Stub(invoker);
    }

{{#unaryMethods}}
    {{#javaDoc}}
    {{{javaDoc}}}
    {{/javaDoc}}
    private static final StubMethodDescriptor {{methodName}}Method = new StubMethodDescriptor("{{originMethodName}}",
    {{inputType}}.class, {{outputType}}.class, serviceDescriptor, MethodDescriptor.RpcType.UNARY,
    obj -> ((Message) obj).toByteArray(), obj -> ((Message) obj).toByteArray(), {{inputType}}::parseFrom,
    {{outputType}}::parseFrom);
{{/unaryMethods}}

{{#serverStreamingMethods}}
    {{#javaDoc}}
    {{{javaDoc}}}
    {{/javaDoc}}
    private static final StubMethodDescriptor {{methodName}}Method = new StubMethodDescriptor("{{originMethodName}}",
    {{inputType}}.class, {{outputType}}.class, serviceDescriptor, MethodDescriptor.RpcType.SERVER_STREAM,
    obj -> ((Message) obj).toByteArray(), obj -> ((Message) obj).toByteArray(), {{inputType}}::parseFrom,
    {{outputType}}::parseFrom);

{{/serverStreamingMethods}}

{{#clientStreamingMethods}}
    {{#javaDoc}}
    {{{javaDoc}}}
    {{/javaDoc}}
    private static final StubMethodDescriptor {{methodName}}Method = new StubMethodDescriptor("{{originMethodName}}",
    {{inputType}}.class, {{outputType}}.class, serviceDescriptor, MethodDescriptor.RpcType.CLIENT_STREAM,
    obj -> ((Message) obj).toByteArray(), obj -> ((Message) obj).toByteArray(), {{inputType}}::parseFrom,
    {{outputType}}::parseFrom);
{{/clientStreamingMethods}}

{{#biStreamingWithoutClientStreamMethods}}
    {{#javaDoc}}
    {{{javaDoc}}}
    {{/javaDoc}}
    private static final StubMethodDescriptor {{methodName}}Method = new StubMethodDescriptor("{{originMethodName}}",
    {{inputType}}.class, {{outputType}}.class, serviceDescriptor, MethodDescriptor.RpcType.BI_STREAM,
    obj -> ((Message) obj).toByteArray(), obj -> ((Message) obj).toByteArray(), {{inputType}}::parseFrom,
    {{outputType}}::parseFrom);
{{/biStreamingWithoutClientStreamMethods}}

    public static class {{interfaceClassName}}Stub implements {{interfaceClassName}}{
        private final Invoker<{{interfaceClassName}}> invoker;

        public {{interfaceClassName}}Stub(Invoker<{{interfaceClassName}}> invoker) {
            this.invoker = invoker;
        }

    {{#unaryMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public {{outputType}} {{methodName}}({{inputType}} request){
            return StubInvocationUtil.unaryCall(invoker, {{methodName}}Method, request);
        }

        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public void {{methodName}}({{inputType}} request, StreamObserver<{{outputType}}> responseObserver){
            StubInvocationUtil.unaryCall(invoker, {{methodName}}Method , request, responseObserver);
        }
    {{/unaryMethods}}

    {{#serverStreamingMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public void {{methodName}}({{inputType}} request, StreamObserver<{{outputType}}> responseObserver){
            StubInvocationUtil.serverStreamCall(invoker, {{methodName}}Method , request, responseObserver);
        }
    {{/serverStreamingMethods}}

    {{#biStreamingWithoutClientStreamMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public StreamObserver<{{inputType}}> {{methodName}}(StreamObserver<{{outputType}}> responseObserver){
            return StubInvocationUtil.biOrClientStreamCall(invoker, {{methodName}}Method , responseObserver);
        }
    {{/biStreamingWithoutClientStreamMethods}}

    {{#clientStreamingMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public StreamObserver<{{inputType}}> {{methodName}}(StreamObserver<{{outputType}}> responseObserver){
        return StubInvocationUtil.biOrClientStreamCall(invoker, {{methodName}}Method , responseObserver);
        }
    {{/clientStreamingMethods}}
    }

    public static abstract class {{interfaceClassName}}ImplBase implements {{interfaceClassName}}, ServerService<{{interfaceClassName}}> {

        @Override
        public final Invoker<{{interfaceClassName}}> getInvoker(URL url) {
            PathResolver pathResolver = url.getOrDefaultFrameworkModel()
            .getExtensionLoader(PathResolver.class)
            .getDefaultExtension();
            Map<String,StubMethodHandler<?, ?>> handlers = new HashMap<>();

        {{#methods}}
            pathResolver.addNativeStub( "/" + SERVICE_NAME + "/{{originMethodName}}" );
        {{/methods}}

        {{#unaryMethods}}
            BiConsumer<{{inputType}}, StreamObserver<{{outputType}}>> {{methodName}}Func = this::{{methodName}};
            handlers.put({{methodName}}Method.getMethodName(), new UnaryStubMethodHandler<>({{methodName}}Func));
        {{/unaryMethods}}

        {{#serverStreamingMethods}}
            handlers.put({{methodName}}Method.getMethodName(), new ServerStreamMethodHandler<>(this::{{methodName}}));
        {{/serverStreamingMethods}}

        {{#clientStreamingMethods}}
            handlers.put({{methodName}}Method.getMethodName(), new BiStreamMethodHandler<>(this::{{methodName}}));
        {{/clientStreamingMethods}}

        {{#biStreamingWithoutClientStreamMethods}}
            handlers.put({{methodName}}Method.getMethodName(), new BiStreamMethodHandler<>(this::{{methodName}}));
        {{/biStreamingWithoutClientStreamMethods}}

            return new StubInvoker<>(this, url, {{interfaceClassName}}.class, handlers);
        }


    {{#unaryMethods}}
        @Override
        public {{outputType}} {{methodName}}({{inputType}} request){
            throw unimplementedMethodException({{methodName}}Method);
        }

    {{/unaryMethods}}

    {{#serverStreamingMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public void {{methodName}}({{inputType}} request, StreamObserver<{{outputType}}> responseObserver){
            throw unimplementedMethodException({{methodName}}Method);
        }
    {{/serverStreamingMethods}}

    {{#biStreamingWithoutClientStreamMethods}}
        @Override
        public StreamObserver<{{inputType}}> {{methodName}}(StreamObserver<{{outputType}}> responseObserver){
            throw unimplementedMethodException({{methodName}}Method);
        }
    {{/biStreamingWithoutClientStreamMethods}}

    {{#clientStreamingMethods}}
        {{#javaDoc}}
            {{{javaDoc}}}
        {{/javaDoc}}
        @Override
        public StreamObserver<{{inputType}}> {{methodName}}(StreamObserver<{{outputType}}> responseObserver){
            throw unimplementedMethodException({{methodName}}Method);
        }
    {{/clientStreamingMethods}}

        @Override
        public final ServiceDescriptor getServiceDescriptor() {
            return serviceDescriptor;
        }
        private RpcException unimplementedMethodException(StubMethodDescriptor methodDescriptor) {
            return TriRpcStatus.UNIMPLEMENTED.withDescription(String.format("Method %s is unimplemented",
                "/" + serviceDescriptor.getInterfaceName() + "/" + methodDescriptor.getMethodName())).asException();
        }
    }

}
